CM2150 Electronic Control System – 019-334   Remote Accelerator Switch Circuit

Resistance Check

TOC

If INSITE™ electronic service tool is available, monitor the switch circuit for proper operation. If
not, follow the troubleshooting procedures in this section.

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Disconnect the original equipment manufacturer (OEM) harness from the electronic control module (ECM).

Insert a test lead into the remote accelerator switch signal of the OEM harness connector and attach it to the multimeter probe. Touch the other probe to engine block ground. Move the remote accelerator switch to the ON position. The multimeter
must show a closed circuit (10 ohms or less).

If the circuit is
not closed, inspect the remote accelerator switch signal line wire for an open circuit. Refer to the OEM troubleshooting and repair manual.

If the resistance is within specification, the remote accelerator switch signal wire
must be checked for short circuit to ground, short circuit from pin-to-pin, and a short circuit to an external voltage source.

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Check for Short Circuit to Ground

TOC

To isolate the remote accelerator switch circuit when checking for a short circuit, disconnect the OEM harness connector from the ECM and the OEM harness from the remote accelerator switch.

Adjust the multimeter to measure resistance. Insert a test lead into the remote accelerator switch signal wire of the OEM harness connector and attach it to a multimeter probe. Touch the other multimeter probe to engine block ground. Measure the resistance.

The multimeter
must show an open circuit (100K ohms or more). If the circuit is
not open, there is a short circuit to ground in the remote accelerator switch circuit, provided the switch has already been checked.

Repair or replace the wire connected to the remote accelerator switch signal. Refer to the OEM troubleshooting and repair manual.

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Check for Short Circuit from Pin to Pin

TOC

Turn the remote accelerator switch to the OFF position. Insert a test lead into the remote accelerator switch signal wire at the OEM harness connector.

Connect the multimeter probe to the test lead. Insert the other multimeter probe with a test lead attached into the switch return wires within the OEM harness connector. Measure the resistance.

The multimeter
must show an open circuit (100K ohms or more).

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Remove the test lead from the remote accelerator switch signal wire and check all other pins. The multimeter
must show an open circuit (100K ohms or more).

If the circuit is
not open, there is a short circuit between the remote accelerator switch signal pin and any other pin that shows a closed circuit, provided the switch has previously been checked.

Repair or replace the wires in the OEM harness. Refer to Procedure
019-071.

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Check for Short Circuit to External Voltage Source

TOC

Turn the vehicle keyswitch to the ON position. Set the remote accelerator switch to the ON position. Set the multimeter to measure VDC. Insert a test lead into the remote accelerator switch signal wire and attach it to a multimeter probe. Touch the other multimeter probe to engine block ground. Measure the voltage, the voltage
must be 1.5 volts or less.

If the voltage is
not correct, there is an external voltage source connected to the circuit, or there is a short circuit between the remote accelerator switch circuit and a wire carrying power in the OEM harness. Repair or replace the OEM harness. Refer to Procedure
019-071.

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Last Modified:  30-May-2008